Home / 21,315.78-29,431.44-13,766.54

Finding the Fourth Proportional to 21,315.78, 29,431.44 and 13,766.54

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Solution

The fourth proportional to 21,315.78, 29,431.44 and 13,766.54 is: 19,007.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.78 : 29,431.44 = 13,766.54 : x
  2. Step 2: Convert to fraction form
    21,315.78/29,431.44 = 13,766.54/x
  3. Step 3: Cross multiply
    21,315.78x = 29,431.44 × 13,766.54
  4. Step 4: Simplify right side
    21,315.78x = 405,168,948.86
  5. Step 5: Solve for x
    x = 405,168,948.86/21,315.78
  6. Step 6: Final answer
    x = 19,007.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.